Honestly, it's going to depend on the hitter FAR more than it will on the bat.
If the hitter is a big strong kid, a TZ or an RT would be fine, but if the hitter is fair to middlin' in size, those are pretty heavy.
The Halo and the Halo-lite at -10 and -12 respectively are also avaiable in the $150-$200 range, but if it's a big kid who has plenty of power (comparably) I probably would stay away from the feather-weight stuff and lean toward something with a bit more mass.
All that being said, unless we're talking serious power hitters, at 14 I'd be surprised if different bats truly made much of a difference. One of the best hitters I ever had was yeas ago, back in LL baseball in 10's. The kid could hit the ball over the 200' fence every time and he wasn't much bigger than a wet chihuahua. The bat he was swinging was so used up, it was almost a triangle and the printing had disappeared years earlier. He had hit rocks, bikes, fences and the local cat so many times that this bat was truly a disaster waiting to happen and the grip was electrical tape! He cried when I made him put it away - it was his older brother's bat and he loved it, but the cracks in the metal were pretty obvious.
Bottom line, as Epstein used to say - it's usually the Indian - not the arrow...
for some good deals on arrows - go here -
http://www.softball-bats.org/--close-outs---baseball-softball-fast-pitch.html